CVE-2026-32887

HIGH

7.4

Description

Effect is a TypeScript framework that consists of several packages that work together to help build TypeScript applications. Prior to version 3.20.0, when using `RpcServer.toWebHandler` (or `HttpApp.toWebHandlerRuntime`) inside a Next.js App Router route handler, any Node.js `AsyncLocalStorage`-dependent API called from within an Effect fiber can read another concurrent request's context — or no context at all. Under production traffic, `auth()` from `@clerk/nextjs/server` returns a different user's session. Version 3.20.0 contains a fix for the issue.

CVE Details

CVSS v3.1 Score7.4

SeverityHIGH

CVSS VectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Attack VectorNETWORK

ComplexityHIGH

Privileges RequiredNONE

User InteractionNONE

Published3/20/2026

Last Modified3/23/2026

Sourcenvd

Honeypot Sightings0

Weaknesses (CWE)

CWE-362

References

https://github.com/Effect-TS/effect/security/advisories/GHSA-38f7-945m-qr2g(security-advisories@github.com)

IOC Correlations

No correlations recorded

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